I had a Gemini 12 from 1965 in the blue tolex for a few years for the house guitar amp. They brought their Marshall Bluesbreaker Combos and Fender Twins but always ended up using the Gemini. It's a great guitar amp. The Gemini I (12") had about 20 watts so the Gemini II (15") was probably about 35 watts. Sometimes I used the Gemini as a low volume practice amp and it sounded real sweet with bass if you kept the volume down. So much so, that when I had it in the shop to be re-capped I tried to get the tech to wire in a pre-amp out jack from the transformer so it could be plugged into a power amp. But it would have required a special order transformer and some other mods so I passed on it. Great guitar amp, but for bass, not so hot unless you are backing up some folk singers and the drummer only plays with brushes.